A5043471097- Advanced Thermoelectric Materials and Devices
- Chalcogenide Semiconductor Thin Films
- Heusler alloys: electronic and magnetic properties
- Magnetic and transport properties of perovskites and related materials
- Thermal properties of materials
- Intermetallics and Advanced Alloy Properties
- Physics of Superconductivity and Magnetism
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Advanced Semiconductor Detectors and Materials
- ZnO doping and properties
- Advanced materials and composites
- Advanced Thermodynamics and Statistical Mechanics
- Aluminum Alloys Composites Properties
- Advanced Condensed Matter Physics
- MXene and MAX Phase Materials
- Surface and Thin Film Phenomena
- Thermal Radiation and Cooling Technologies
- Advanced Welding Techniques Analysis
- 2D Materials and Applications
- High Entropy Alloys Studies
- Chemical and Physical Properties of Materials
- Semiconductor materials and interfaces
- Thermal Expansion and Ionic Conductivity
- Advanced ceramic materials synthesis
National Institute for Materials Science
2022-2025
University of Tsukuba
2022-2024
National University of Science and Technology
2019-2022
Abstract Oxides are of interest for thermoelectrics due to their high thermal stability, chemical inertness, low cost, and eco‐friendly constituting elements. Here, adopting a unique synthesis route via co‐precipitation at strongly alkaline conditions, one the highest thermoelectric performances ZnO ceramics ( 21.5 µW cm −1 K −2 0.5 1100 in ) is achieved. These results linked distinct modification electronic structure: charge carriers become trapped edge conduction band Anderson...
Bismuth telluride-based alloys possess the highest efficiencies for low-temperature-range (<500 K) applications among thermoelectric materials. Despite significant advances in efficiency of p-type Bi2Te3-based materials through engineering electronic band structure by convergence multiple bands, n-type pair still suffers from poor due to a lower number electron pockets near conduction edge than valence band. To overcome persistent low materials, we have fabricated multiphase pseudobinary...
Abstract Decoupling charge and heat transport is essential for optimizing thermoelectric materials. Strategies to inhibit lattice-driven transport, however, also compromise carrier mobility, limiting the performance of most thermoelectrics, including Fe 2 VAl Heusler compounds. Here, we demonstrate an innovative approach, which bypasses this tradeoff: via liquid-phase sintering, incorporate archetypal topological insulator Bi 1− x Sb between V 0.95 Ta 0.1 Al grains. Structural investigations...
The thermoelectric (TE) performance of pristine Bi2Se3 is inferior to that Bi2Te3. Therefore, the study on has faced a decline. lower due low power factor and high thermal conductivity. In recent years, single aliovalent doping been adopted improve TE Bi2Se3. Here, we adopt an isovalent co-doping approach using indium antimony create manifold enhancement in via creation neutral impurities deep defect states (DDSs). A figure merit (ZT = 0.47) obtained at 473 K for concentration 0.1 at. %....
Spark plasma sintering (SPS) is widely used for the consolidation of different materials. Copper-based pseudo alloys have found a variety applications including as electrodes in vacuum interrupters high-voltage electric circuits. How does kinetics SPS such depend on heating rate? Do microstructure media to be sintered? These questions were addressed by investigation rate range 0.1 50 K/s. The latter conditions achieved through flash spark (FSPS). We also compared conventional copper–chromium...
Bismuth telluride (Bi2Te3) and its alloys are among the best thermoelectric materials at room temperature. Bi14Te13S8, a material with similar crystal structure, contains sulfur that can potentially improve performance through widening band gap reducing lattice thermal conductivity. This compound forms in sulfur-added Bi2Te3 alloys. Here, polycrystalline iodine-doped Bi14Te13S8 sample is investigated; an optimum iodine concentration of 1 at. % resulted power factor 3.5 mW2·m–1·K–1 Iodine...
Abstract Bismuth chalcogenides are promising materials for thermoelectric (TE) application due to their high power factor (product of the square Seebeck coefficient and electrical conductivity). However, thermal conductivity is an issue concern. Single doping has proven be useful in improving TE performance recent years. Here, it shown that dual isovalent shows synergistic effect reduction electron density control. The insertion large atoms layered Bi 2 Te 3 structure distorts crystal...
The demonstration of strong coupling between the processing conditions, microstructure, distribution, shape, and size InSb precipitates in In-filled Co 4 Sb 12 .
In this study, we demonstrate that introduction of rare-earth elements, R = La or Pr, into the Bi–O charge reservoir layer BiCuSeO leads to an increase both carrier concentration and effective mass. Although mobility slightly decreases upon Bi3+ R3+ substitution, electronic transport properties are significantly improved in a broad temperature range from 100 800 K. particular, electrical resistivity by 2 times, while Seebeck coefficient drops 323 238 μV K–1 at Thus, power factor nearly 3 μW...
Abstract Bi 2 SeO is a promising n ‐type semiconductor to pair with p BiCuSeO in thermoelectric (TE) device. The TE figure of merit zT and, therefore, the device efficiency must be optimized by tuning carrier concentration. However, electron concentrations self‐doped span several orders magnitude, even samples same nominal compositions. Such unsystematic variations concentration have thermodynamic origin related native defect concentrations. In this study, first‐principles calculations are...
The effect of isovalent sulphur substitution on the thermoelectric properties n-type Bi2Te2.7Se0.3 alloy has been studied systematically. At low concentrations, where samples are single phase, changes in defect chemistry and density states impacted significantly electrical resistivity thermopower, improving thermopower while reducing thermal conductivity due to increased phonon scattering at defects. This reduction was particularly noticeable containing Bi2S3-based secondary phase. these...
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Thermoelectric (TE) materials are useful for applications such as waste heat harvesting or efficient and targeted cooling. While various strategies towards superior thermoelectrics through a reduction of the lattice thermal conductivity have been developed, path to enhance power factor is pressing. Here, we report large factors up 5 mW m$^{-1}$ K$^{-2}$ at room temperature in kagome metal Ni$_3$In$_{1-x}$Sn$_x$. This system predicted feature almost dispersionless flat bands conjunction with...